Year	Percent
1992	2.18923
1993	2.45902
1994	1.38282
1995	2.25173
1996	1.98038
1997	1.90834
1998	1.93158
1999	2.19409
2000	1.90069
2001	3.98491
2002	3.89365
2003	3.73474
2004	3.70313
2005	3.71168
2006	3.6991
2007	3.68202
2008	3.66319
2009	3.64544
2010	3.63407
2011	3.13293
2012	3.13138
2013	3.1325
2014	3.1336
2015	3.13359
2016	3.08331
2017	3.08449
2018	3.10784
2019	3.11806
2020	3.20385