Year	Percent
1991	5.339
1992	4.337
1993	4.244
1994	4.131
1995	4.219
1996	4.189
1997	4.124
1998	3.993
1999	3.831
2000	3.718
2001	3.627
2002	3.134
2003	1.869
2004	1.322
2005	1.229
2006	1.187
2007	1.189
2008	1.148
2009	1.156
2010	1.268
2011	1.221
2012	1.208
2013	1.195
2014	1.218
2015	1.232
2016	1.222
2017	1.228
2018	1.214
2019	1.182
2020	1.132
2021	1.079
2022	1.025