Year	Number
1996	78.391960144043
1998	73.5
2000	79.6019897460938
2002	67.6616897583008
2003	63.1840782165527
2004	59.6153831481934
2005	57.8947372436523
2006	57.8947372436523
2007	56.4593315124512
2008	56.730770111084
2009	54.502368927002
2010	54.028434753418
2011	54.4600944519043
2012	56.8075103759766
2013	55.3990592956543
2014	60.5769233703613
2015	58.5714302062988
2016	59.0476188659668
2017	60
2018	60
2019	61.4285697937012
2020	62.3809509277344
2021	61.9047622680664
2022	59.9056587219238