Year	Percent
1990	64.031
1991	36.16995
1992	19.68183
1993	31.62175
1994	21.5325
1995	18.54722
1996	18.92479
1997	21.09789
1998	26.35407
1999	32.24017
2000	17.14974
2001	19.29087
2002	10.95354
2003	9.99779
2004	9.47253
2005	9.53482
2006	9.20607
2007	6.5231
2008	10.34385
2009	16.43139
2010	18.50914
2011	26.52876
2012	23.10029
2013	31.73504
2014	34.36194
2015	239.29831
2016	621.58012