Quarter	Percent
1997-03-31	198.2
1997-06-30	198.3
1997-09-30	196
1997-12-31	192.8
1998-03-31	187.2
1998-06-30	188.4
1998-09-30	185.6
1998-12-31	182.4
1999-03-31	43.8
1999-06-30	43.9
1999-09-30	43.1
1999-12-31	42.9
2000-03-31	41.2
2000-06-30	41.6
2000-09-30	40.4
2000-12-31	40.5
2001-03-31	38.4
2001-06-30	38.2
2001-09-30	37.4
2001-12-31	37.4
2002-03-31	36.3
2002-06-30	36.7
2002-09-30	36.4
2002-12-31	37.7
2003-03-31	37
2003-06-30	37.1
2003-09-30	37.4
2003-12-31	38.2
2004-03-31	38.2
2004-06-30	38.7
2004-09-30	38.6
2004-12-31	39.9