Year	Number
1982	0.4349717268
1983	0.5216462401
1984	0.6083207533
1985	0.6949952665
1986	0.7816697797
1987	0.8683442929
1988	0.9550188061
1989	1.0416933193
1990	1.1283678326
1991	1.2150423458
1992	1.301716859
1993	1.3883913722
1994	1.4750658854
1995	1.5617403986
1996	1.6484149119
1997	1.7350894251
1998	1.8217639383
1999	1.9084384515
2000	1.9682470639
2001	2.0165289256
2002	2.0648107873
2003	2.113092649
2004	2.1613745107
2005	2.2096563723
2006	2.2096563723
2007	2.2096563723
2008	2.2096563723
2009	2.2096563723
2010	2.2096563723
2011	2.2096563723
2012	2.2096563723
2013	2.2096563723
2014	2.2096563723
2015	2.2096563723
2016	2.2096563723
2017	2.2096563723
2018	2.2096563723
2019	2.2096563723
2020	2.2096563723