Year	Number
1990	168.0172413793
1991	170.9217506631
1992	179.1097480106
1993	187.8348806366
1994	196.5600132626
1995	205.2851458886
1996	214.0102785146
1997	222.7354111406
1998	231.4605437666
1999	240.1856763926
2000	248.9108090186
2001	234.7623784262
2002	220.6139478338
2003	205.775862069
2004	201.105015674
2005	196.434169279
2006	191.763322884
2007	187.092476489
2008	182.421630094
2009	177.7507836991
2010	173.0799373041
2011	168.4090909091
2012	163.7382445141
2013	159.0673981191
2014	154.3965517241
2015	137.1551724138
2016	133.7068965517
2017	133.7068965517
2018	133.7068965517
2019	133.7068965517
2020	133.7068965517