Month	Percent
1999-03-31	43.8
1999-04-30	43.4
1999-05-31	43.4
1999-06-30	43.9
1999-07-31	43.3
1999-08-31	43.2
1999-09-30	43.1
1999-10-31	42
1999-11-30	42.1
1999-12-31	42.9
2000-01-31	41
2000-02-29	40.5
2000-03-31	41.2
2000-04-30	41.2
2000-05-31	40.9
2000-06-30	41.6
2000-07-31	41.3
2000-08-31	41.7
2000-09-30	40.4
2000-10-31	40
2000-11-30	40.6
2000-12-31	40.5
2001-01-31	39.2
2001-02-28	38.4
2001-03-31	38.4
2001-04-30	37.9
2001-05-31	37.9
2001-06-30	38.2
2001-07-31	37.7
2001-08-31	37.5
2001-09-30	37.4
2001-10-31	37.2
2001-11-30	36.9
2001-12-31	37.4
2002-01-31	36.8
2002-02-28	36.3
2002-03-31	36.3
2002-04-30	36.2
2002-05-31	36.5
2002-06-30	36.7
2002-07-31	36.2
2002-08-31	35.7
2002-09-30	36.4
2002-10-31	37.2
2002-11-30	37.1
2002-12-31	37.7
2003-01-31	37
2003-02-28	36.7
2003-03-31	37
2003-04-30	36.2
2003-05-31	36.6
2003-06-30	37.1
2003-07-31	37.1
2003-08-31	36.9
2003-09-30	37.4
2003-10-31	37.8
2003-11-30	38.3
2003-12-31	38.2
2004-01-31	37.9
2004-02-29	37.8
2004-03-31	38.2
2004-04-30	38
2004-05-31	38.4
2004-06-30	38.7
2004-07-31	38.3
2004-08-31	38.1
2004-09-30	38.6
2004-10-31	38.5
2004-11-30	38.9
2004-12-31	39.9
2005-01-31	39.1
2005-02-28	39