Year	Percent
1991	4.066
1992	2.889
1993	2.363
1994	1.971
1995	2.083
1996	2.446
1997	2.707
1998	2.489
1999	2.396
2000	2.472
2001	2.283
2002	2.319
2003	2.3
2004	2.553
2005	2.59
2006	2.66
2007	2.666
2008	2.957
2009	2.464
2010	2.763
2011	2.643
2012	2.558
2013	2.398
2014	2.47
2015	2.19
2016	2.258
2017	2.31
2018	2.309
2019	2.312
2020	2.321
2021	2.326
2022	2.328