Year	Percent
1991	11.86441
1992	28.9375
1993	23.32335
1994	-0.34748
1995	-0.23367
1996	-0.82798
1997	-25.85829
1998	-38.14731
1999	-27.3556
2000	14.56279
2001	4.52646
2002	15.64311
2003	5.69642
2004	2.12039
2005	17.24998
2006	38.1704
2007	36.69409
2008	23.68261
2009	29.35533
2010	31.84043
2011	31.16479
2012	28.86491