Year	% change from 1990
1991	1.62703489654563
1992	3.60965279922354
1993	5.7987382538492
1994	7.97458860899103
1995	9.97573565094629
1996	12.0501169100454
1997	13.9515595358892
1998	15.6359465301981
1999	17.0750430140733
2000	18.2485551683063
2001	18.1126748136057
2002	17.667975470949
2003	17.0088675166542
2004	16.241231746592
2005	15.4480081175277
2006	15.8794723607006
2007	16.3074072440111
2008	16.8023999647064
2009	17.2532756871222
2010	17.7050337495037
2011	18.8820840869987
2012	20.0591344244938