Year	Number
1996	37.5
1998	41.7910461425781
2000	50.2487564086914
2002	51.7412948608398
2003	50.7462692260742
2004	51.4423065185547
2005	48.5576934814453
2006	45.6730766296387
2007	45.1923065185547
2008	44.711540222168
2009	48.8151664733887
2010	48.8151664733887
2011	46.478874206543
2012	45.5399055480957
2013	45.5399055480957
2014	39.4088668823242
2015	36.9458122253418
2016	37.4384231567383
2017	36.4532012939453
2018	37.8640785217285
2019	39.1304359436035
2020	37.6811599731445
2021	36.2318840026855
2022	37.1980667114258