Year	Percent
1992	2.40023
1993	5.00047
1994	1.94658
1995	2.7369
1996	2.25423
1997	2.32405
1998	2.41236
1999	2.62511
2000	2.26786
2001	2.31206
2002	2.24331
2003	2.42636
2004	2.62948
2005	2.29907
2006	3.41776
2007	2.86419
2008	3.29121
2009	3.32542
2010	2.791
2011	4.67014
2012	4.65862
2013	4.54092
2014	4.55501
2015	5.46769
2016	3.69046
2017	3.9374