Year	% change from 1990
1991	-0.700855077051732
1992	-2.6713751487624
1993	-4.08002613817001
1994	-3.57385302696599
1995	-4.97353171707801
1996	-5.59431325513325
1997	-8.80673498028632
1998	-9.7967350987884
1999	-12.7227204011464
2000	-13.2145039757443
2001	-12.8039789608046
2002	-13.9226384654321
2003	-15.7705935429917
2004	-15.7330114591498
2005	-16.1315169788067
2006	-16.2855696648254
2007	-16.1509851753915
2008	-16.2593299216024
2009	-17.083596436135
2010	-15.4860192955221
2011	-17.0009856483358
2012	-17.0443086991402