Year	% change from 1990
1991	3.12223504520099
1992	6.25889594152722
1993	9.39603769955761
1994	9.47489901904213
1995	65.5510675129833
1996	66.0376995576072
1997	66.2516830159646
1998	66.5781881130987
1999	66.8792075399115
2000	68.0222158107328
2001	67.5687632236969
2002	68.299192152337
2003	68.5088478553568
2004	68.2496633968071
2005	68.1953260242354
2006	68.1837853433352
2007	68.4602808232352
2008	68.4583573764185
2009	67.0268320830929
2010	68.3107328332371
2011	69.9938401615695
2012	71.6769474899019