Year	Number
1996	56.5
1998	41.7910461425781
2000	51.7412948608398
2002	50.7462692260742
2003	55.7213935852051
2004	56.730770111084
2005	58.1730766296387
2006	51.4423065185547
2007	52.8846168518066
2008	51.9230766296387
2009	53.0805702209473
2010	51.6587677001953
2011	50.7042236328125
2012	48.8262901306152
2013	46.0093879699707
2014	43.8423652648926
2015	41.3793106079102
2016	34.4827575683594
2017	32.019702911377
2018	29.6116504669189
2019	28.9855079650879
2020	29.9516906738281
2021	29.9516906738281
2022	28.9855079650879