Quarter	Percent
1987-12-31	18.1
1988-03-31	28.8
1988-06-30	54.3
1988-09-30	51.7
1988-12-31	38.3
1989-03-31	29
1989-06-30	9.8
1989-09-30	8.3
1989-12-31	21.6
1990-03-31	24.8
1990-06-30	12.1
1990-09-30	7.9
1990-12-31	17.6
1991-03-31	10.8
1991-06-30	2.8
1991-09-30	-4.7
1991-12-31	-17.2
1992-03-31	-18
1992-06-30	-8.3
1992-09-30	7
1992-12-31	6.7
1993-03-31	4.1
1993-06-30	-0.5
1993-09-30	-14.7
1993-12-31	-5.8
1994-03-31	-8
1994-06-30	-9.3
1994-09-30	17.7
1994-12-31	23.2
1995-03-31	34.7
1995-06-30	51.8
1995-09-30	21.2
1995-12-31	5
1996-03-31	-5.3
1996-06-30	-22.5
1996-09-30	-20.3
1996-12-31	-7.4
1997-03-31	3
1997-06-30	15.7