Month	Percent
1999-03-31	38.9
1999-04-30	38.5
1999-05-31	38.6
1999-06-30	39.1
1999-07-31	38.5
1999-08-31	38.3
1999-09-30	38.3
1999-10-31	37.2
1999-11-30	37.1
1999-12-31	38.1
2000-01-31	36.1
2000-02-29	35.7
2000-03-31	36.3
2000-04-30	35.5
2000-05-31	34
2000-06-30	34.8
2000-07-31	33.9
2000-08-31	33.8
2000-09-30	32.8
2000-10-31	31.9
2000-11-30	32
2000-12-31	32.9
2001-01-31	31.2
2001-02-28	30.9
2001-03-31	31.3
2001-04-30	30.8
2001-05-31	31
2001-06-30	31.7
2001-07-31	30.9
2001-08-31	30.7
2001-09-30	30.8
2001-10-31	30.1
2001-11-30	30.6
2001-12-31	31.5
2002-01-31	30.2
2002-02-28	29.8
2002-03-31	30.3
2002-04-30	30
2002-05-31	30.1
2002-06-30	30.6
2002-07-31	29.9
2002-08-31	30
2002-09-30	30.5
2002-10-31	30.9
2002-11-30	31.4
2002-12-31	32.4
2003-01-31	31.1
2003-02-28	30.8
2003-03-31	31.6
2003-04-30	30.9
2003-05-31	31.2
2003-06-30	31.9
2003-07-31	31.3
2003-08-31	31.4
2003-09-30	31.9
2003-10-31	31.8
2003-11-30	32.1
2003-12-31	33.2
2004-01-31	31.9
2004-02-29	31.8
2004-03-31	32.9
2004-04-30	32.6
2004-05-31	32.8
2004-06-30	33.6
2004-07-31	32.8
2004-08-31	32.9
2004-09-30	33.6
2004-10-31	33.3
2004-11-30	33.9
2004-12-31	35
2005-01-31	33.4
2005-02-28	33.5