Year	Number
1991	85.5
1992	86.4736652237
1993	87.4473304473
1994	88.420995671
1995	86.9660894661
1996	87.9397546898
1997	88.9134199134
1998	89.8870851371
1999	90.8607503608
2000	92.8571428571
2001	90.7922077922
2002	89.75
2003	84.7142857143
2004	87.9142857143
2005	91.1142857143
2006	94.3142857143
2007	97.5142857143
2008	100.7142857143
2009	103.9142857143
2010	107.1142857143
2011	110.3142857143
2012	113.5142857143
2013	116.7142857143
2014	116.7142857143
2015	116.7142857143
2016	116.7142857143
2017	116.7142857143
2018	116.7142857143
2019	116.7142857143
2020	116.7142857143