Year	Number
1996	81.5
1998	78.6069641113281
2000	80.5970153808594
2002	74.6268692016602
2003	77.1144256591797
2004	85.0961532592773
2005	82.6923065185547
2006	76.4423065185547
2007	74.038459777832
2008	75.961540222168
2009	74.8815155029297
2010	75.3554534912109
2011	76.5258178710938
2012	81.2206573486328
2013	81.6901397705078
2014	70.9359588623047
2015	72.4137954711914
2016	72.9064025878906
2017	72.9064025878906
2018	68.4466018676758
2019	70.5314025878906
2020	70.5314025878906
2021	66.1835784912109
2022	67.6328506469727