Year	Percent
1990	6.9475
1991	10.76321
1992	5.12874
1993	2.77229
1994	4.45232
1995	10.21292
1996	16.18285
1997	31.08531
1998	17.47754
1999	28.95342
2000	56.55549
2001	70.78168
2002	83.17303
2003	91.37288
2004	101.48695
2005	112.11282
2006	132.01955
2007	126.02089
2008	130.92536
2009	102.8051
2010	91.46622
2011	70.51617
2012	79.69306
2013	70.60052