Year	% change from 1990
1991	-4.63238703694162
1992	-10.4841396602951
1993	-15.4778710907311
1994	-23.947996633864
1995	-36.4875401446065
1996	-33.6519140604874
1997	-40.7068885568551
1998	-42.229206381919
1999	-41.4505298229344
2000	-40.1360193724561
2001	-40.3537877616913
2002	-39.3233379703574
2003	-38.9535782369004
2004	-39.2005427035568
2005	-38.3231147062359
2006	-39.2036340529308
2007	-38.0830199048551
2008	-37.0657942191767
2009	-34.3500437941161
2010	-31.8463942844385
2011	-29.0755345698008
2012	-26.3045031135312