Year	Percent
1992	4.5671
1993	40.1515
1994	112.95588
1995	80.31449
1996	44.34971
1997	48.96742
1998	77.1861
1999	90.41185
2000	70.54634
2001	47.14582
2002	56.07345
2003	76.77773
2004	64.51305
2005	58.88915
2006	39.45468
2007	25.12243
2008	21.25588
2009	21.84682
2010	28.31933
2011	27.73452
2012	20.37433
2013	21.69523
2014	22.82562
2015	33.45869
2016	22.46629
2017	18.34615
2018	14.73427