Year	Number
1991	0.1418803419
1992	0.4126495726
1993	0.6834188034
1994	0.9541880342
1995	1.224957265
1996	1.4957264957
1997	1.4957264957
1998	1.4957264957
1999	1.4957264957
2000	1.4957264957
2001	1.4957264957
2002	1.4957264957
2003	1.4957264957
2004	1.4957264957
2005	1.4957264957
2006	1.4957264957
2007	1.4957264957
2008	1.4957264957
2009	1.4957264957
2010	1.4957264957
2011	1.4957264957
2012	1.4957264957
2013	1.4957264957
2014	1.4957264957
2015	1.4957264957
2016	1.4957264957
2017	1.4957264957
2018	1.4957264957
2019	1.4957264957
2020	1.4957264957