Year	Number
1996	63.5
1998	63.1840782165527
2000	62.1890563964844
2002	63.6815910339355
2003	65.1741256713867
2004	66.3461532592773
2005	66.3461532592773
2006	65.8653869628906
2007	68.2692337036133
2008	65.8653869628906
2009	64.9289093017578
2010	64.4549789428711
2011	61.5023460388184
2012	61.5023460388184
2013	58.2159614562988
2014	59.6059112548828
2015	61.0837440490723
2016	59.1133003234863
2017	60.0985221862793
2018	58.737865447998
2019	58.4541053771973
2020	56.038646697998
2021	56.5217399597168
2022	57.0048294067383