Year	Percent
1991	3.727
1992	6.597
1993	3.499
1994	3.373
1995	4.096
1996	3.229
1997	2.998
1998	3.657
1999	2.266
2000	3.065
2001	1.851
2002	2.607
2003	3.324
2004	2.293
2005	2.202
2006	2.296
2007	2.374
2008	2.035
2009	1.728
2010	1.377
2011	1.552
2012	1.664
2013	2.109
2014	1.89
2015	1.288
2016	1.367
2017	1.353
2018	1.304
2019	1.261
2020	1.222
2021	1.186
2022	1.154