Year	Percent
1991	2.612
1992	2.532
1993	2.57
1994	2.546
1995	2.356
1996	2.325
1997	2.266
1998	2.301
1999	2.138
2000	1.877
2001	1.556
2002	1.554
2003	1.507
2004	1.476
2005	1.554
2006	1.55
2007	1.464
2008	1.337
2009	1.351
2010	1.327
2011	1.287
2012	1.271
2013	1.247
2014	1.201
2015	1.17
2016	1.134
2017	1.133
2018	1.105
2019	1.076
2020	1.053
2021	1.03
2022	1.01