Year	% change from 1990
1991	-1.36795566493546
1992	-2.85955173993743
1993	-4.4259759092391
1994	-3.51252590065251
1995	-4.21613550602268
1996	-4.57907137676599
1997	-5.10198233777013
1998	-5.41895309895203
1999	-7.76468211570435
2000	-8.19045772905067
2001	-8.38547714639338
2002	-8.94846331518283
2003	-9.41488681702954
2004	-10.1468556633264
2005	-11.1301621264092
2006	-11.4250258875307
2007	-10.4689658668232
2008	-11.043018146052
2009	-12.1293426846471
2010	-12.4709241445491
2011	-13.1300506542874
2012	-14.1071778089181