Year	Percent
1991	2.066
1992	2.072
1993	2.147
1994	2.133
1995	2.098
1996	2.03
1997	2.045
1998	2.162
1999	3.499
2000	3.208
2001	3.313
2002	3.285
2003	3.129
2004	2.788
2005	2.606
2006	2.583
2007	2.57
2008	2.426
2009	2.814
2010	1.21
2011	1.131
2012	1.187
2013	1.226
2014	1.42
2015	1.38
2016	1.419
2017	1.453
2018	1.453
2019	1.452
2020	1.45
2021	1.449
2022	1.448