Year	Number
1990	60.0408639813
1991	62.0715536652
1992	64.1022433492
1993	66.1329330331
1994	68.163622717
1995	70.194312401
1996	72.2250020849
1997	74.2556917688
1998	76.4319906597
1999	78.6082895505
2000	80.7845884413
2001	82.9608873322
2002	85.137186223
2003	85.1654018291
2004	85.1936174353
2005	85.2218330414
2006	85.2218330414
2007	85.2218330414
2008	85.2218330414
2009	85.2218330414
2010	85.2218330414
2011	85.2218330414
2012	85.2218330414
2013	85.2218330414
2014	85.2218330414
2015	85.2218330414
2016	85.2218330414
2017	85.2218330414
2018	85.2218330414
2019	85.2218330414
2020	85.2218330414