Year	Percent
1991	1.349
1992	1.243
1993	1.198
1994	1.138
1995	1.051
1996	1.002
1997	0.943
1998	0.874
1999	0.842
2000	0.796
2001	0.111
2002	0.073
2003	0.592
2004	0.867
2005	0.589
2006	0.314
2007	0.388
2008	0.396
2009	0.451
2010	0.276
2011	0.206
2012	0.346
2013	0.464
2014	0.438
2015	0.387
2016	0.255
2017	0.234
2018	0.223
2019	0.213
2020	0.204
2021	0.196
2022	0.188