Year	Percent
1991	2.876
1992	2.882
1993	2.502
1994	2.433
1995	2.28
1996	2.259
1997	2.192
1998	2.055
1999	2.053
2000	2.032
2001	1.92
2002	1.78
2003	1.663
2004	1.518
2005	1.539
2006	1.479
2007	1.408
2008	1.381
2009	1.313
2010	1.356
2011	1.396
2012	1.341
2013	1.305
2014	1.237
2015	1.177
2016	1.217
2017	1.285
2018	1.293
2019	1.303
2020	1.307
2021	1.3
2022	1.281