Month	Hours
1987-01-01	29720000
1987-02-01	34300000
1987-03-01	33560000
1987-04-01	31280000
1987-05-01	31280000
1987-06-01	31180000
1987-07-01	11510000
1987-08-01	31500000
1987-09-01	34130000
1987-10-01	33810000
1987-11-01	34590000
1987-12-01	29130000
1988-01-01	29820000
1988-02-01	33870000
1988-03-01	33080000
1988-04-01	31680000
1988-05-01	31780000
1988-06-01	31420000
1988-07-01	13710000
1988-08-01	31790000
1988-09-01	32960000
1988-10-01	33910000
1988-11-01	35590000
1988-12-01	28540000
1989-01-01	30450000
1989-02-01	34990000
1989-03-01	33340000
1989-04-01	30570000
1989-05-01	31800000
1989-06-01	32540000
1989-07-01	12310000
1989-08-01	32980000
1989-09-01	34180000
1989-10-01	32680000
1989-11-01	35410000
1989-12-01	29520000
1990-01-01	30090000
1990-02-01	33930000
1990-03-01	33190000
1990-04-01	30320000
1990-05-01	30300000
1990-06-01	31610000
1990-07-01	11570000
1990-08-01	32810000
1990-09-01	33210000
1990-10-01	32430000
1990-11-01	33280000
1990-12-01	27530000
1991-01-01	29420000
1991-02-01	31900000
1991-03-01	31260000
1991-04-01	29480000
1991-05-01	28420000
1991-06-01	28860000
1991-07-01	10340000
1991-08-01	30010000
1991-09-01	29950000
1991-10-01	30450000
1991-11-01	30920000
1991-12-01	25120000
1992-01-01	27210000
1992-02-01	29170000
1992-03-01	29160000
1992-04-01	27110000
1992-05-01	26220000
1992-06-01	27210000
1992-07-01	8790000
1992-08-01	26850000
1992-09-01	29070000
1992-10-01	28460000
1992-11-01	29030000
1992-12-01	23490000
1993-01-01	24320000
1993-02-01	26390000
1993-03-01	26930000
1993-04-01	24020000
1993-05-01	25170000
1993-06-01	24960000
1993-07-01	10820000
1993-08-01	24100000
1993-09-01	27490000
1993-10-01	27010000
1993-11-01	27140000
1993-12-01	22670000
1994-01-01	23900000
1994-02-01	26400000
1994-03-01	24830000
1994-04-01	25890000
1994-05-01	23780000
1994-06-01	25870000
1994-07-01	11810000
1994-08-01	24320000
1994-09-01	27080000
1994-10-01	28710000
1994-11-01	28450000
1994-12-01	24340000
1995-01-01	26660000
1995-02-01	27990000
1995-03-01	27440000
1995-04-01	25850000
1995-05-01	25270000
1995-06-01	26150000
1995-07-01	13270000
1995-08-01	25170000
1995-09-01	28980000
1995-10-01	30550000
1995-11-01	30070000
1995-12-01	25000000
1996-01-01	27370000
1996-02-01	29110000
1996-03-01	28520000
1996-04-01	26630000
1996-05-01	25500000
1996-06-01	27280000
1996-07-01	13720000
1996-08-01	23740000
1996-09-01	28090000
1996-10-01	29630000
1996-11-01	29550000
1996-12-01	24870000
1997-01-01	22500000
1997-02-01	28290000
1997-03-01	27820000
1997-04-01	28110000
1997-05-01	23000000
1997-06-01	28360000
1997-07-01	14980000
1997-08-01	23020000
1997-09-01	28640000
1997-10-01	29820000
1997-11-01	29230000
1997-12-01	25220000
1998-01-01	21590000
1998-02-01	28110000
1998-03-01	28790000
1998-04-01	26260000
1998-05-01	25550000
1998-06-01	27470000
1998-07-01	15890000
1998-08-01	22590000
1998-09-01	28930000
1998-10-01	29570000
1998-11-01	29000000
1998-12-01	21670000
1999-01-01	26500000
1999-02-01	28130000
1999-03-01	26340000
1999-04-01	27410000
1999-05-01	25690000
1999-06-01	26640000
1999-07-01	14100000
1999-08-01	24320000
1999-09-01	28050000
1999-10-01	28840000
1999-11-01	28560000
1999-12-01	23700000
2000-01-01	25150000
2000-02-01	27820000
2000-03-01	27470000
2000-04-01	25680000
2000-05-01	27760000
2000-06-01	24360000
2000-07-01	14140000
2000-08-01	23000000
2000-09-01	28080000
2000-10-01	29240000
2000-11-01	28590000
2000-12-01	24170000
2001-01-01	26080000
2001-02-01	28410000
2001-03-01	26900000
2001-04-01	24860000
2001-05-01	24620000
2001-06-01	25140000
2001-07-01	13200000
2001-08-01	22180000
2001-09-01	26390000
2001-10-01	27320000
2001-11-01	28400000
2001-12-01	21740000
2002-01-01	22130000
2002-02-01	26990000
2002-03-01	24880000
2002-04-01	25120000
2002-05-01	22100000
2002-06-01	24810000
2002-07-01	12630000
2002-08-01	20780000
2002-09-01	25600000
2002-10-01	25700000
2002-11-01	26430000
2002-12-01	21970000
2003-01-01	19380000
2003-02-01	25350000
2003-03-01	25720000
2003-04-01	22740000
2003-05-01	23700000
2003-06-01	23100000
2003-07-01	12250000
2003-08-01	19000000
2003-09-01	25150000
2003-10-01	25530000
2003-11-01	24670000
2003-12-01	21620000
2004-01-01	17900000
2004-02-01	24770000
2004-03-01	24910000
2004-04-01	22780000
2004-05-01	22890000
2004-06-01	23410000
2004-07-01	13820000
2004-08-01	17650000
2004-09-01	25070000
2004-10-01	25080000
2004-11-01	25140000
2004-12-01	21120000
2005-01-01	21950000
2005-02-01	24050000
2005-03-01	22940000
2005-04-01	24520000
2005-05-01	22400000
2005-06-01	23190000
2005-07-01	12200000
2005-08-01	17730000
2005-09-01	24210000
2005-10-01	23840000
2005-11-01	24420000
2005-12-01	21150000
2006-01-01	21230000
2006-02-01	22830000
2006-03-01	24460000
2006-04-01	21460000
2006-05-01	21460000
2006-06-01	22390000
2006-07-01	13080000
2006-08-01	18640000
2006-09-01	24260000
2006-10-01	24910000
2006-11-01	23970000
2006-12-01	20680000
2007-01-01	22870000
2007-02-01	23240000
2007-03-01	23900000
2007-04-01	22170000
2007-05-01	21460000
2007-06-01	22600000
2007-07-01	12800000
2007-08-01	18450000
2007-09-01	24010000
2007-10-01	24720000
2007-11-01	24300000
2007-12-01	20300000
2008-01-01	20790000
2008-02-01	24140000
2008-03-01	21770000
2008-04-01	24920000
2008-05-01	22280000
2008-06-01	22480000
2008-07-01	13790000
2008-08-01	17160000
2008-09-01	23010000
2008-10-01	25170000