Year	Number
1990	139.1428571429
1991	141.3714285714
1992	143.6
1993	145.8285714286
1994	148.0571428571
1995	150.2857142857
1996	152.5142857143
1997	154.7428571429
1998	156.9714285714
1999	159.2
2000	161.1428571429
2001	162.8666666667
2002	164.5904761905
2003	166.3142857143
2004	168.0380952381
2005	169.7619047619
2006	169.7619047619
2007	169.7619047619
2008	169.7619047619
2009	169.7619047619
2010	169.7619047619
2011	169.7619047619
2012	169.7619047619
2013	169.7619047619
2014	169.7619047619
2015	169.7619047619
2016	169.7619047619
2017	169.7619047619
2018	169.7619047619
2019	169.7619047619
2020	169.7619047619