Year	Number
1987	0.0238663484
1988	0.0241050119
1989	0.0243436754
1990	0.0245823389
1991	0.0248210024
1992	0.0250596659
1993	0.0252983294
1994	0.0255369928
1995	0.0257756563
1996	0.0260143198
1997	0.0262529833
1998	0.0264916468
1999	0.0267303103
2000	0.0269689737
2001	0.0272076372
2002	0.0274463007
2003	0.0274463007
2004	0.0274463007
2005	0.0274463007
2006	0.0274463007
2007	0.0274463007
2008	0.0274463007
2009	0.0274463007
2010	0.0274463007
2011	0.0274463007
2012	0.0274463007
2013	0.0274463007
2014	0.0274463007
2015	0.0274463007
2016	0.0274463007
2017	0.0274463007
2018	0.0274463007
2019	0.0274463007
2020	0.0274463007