Year	Number
1996	63.5
1998	64.6766204833984
2000	65.1741256713867
2002	65.6716384887695
2003	61.1940307617188
2004	58.1730766296387
2005	59.1346168518066
2006	61.0576934814453
2007	62.980770111084
2008	63.461540222168
2009	63.0331764221191
2010	66.8246459960938
2011	58.2159614562988
2012	57.7464790344238
2013	59.1549301147461
2014	66.5024642944336
2015	68.4729080200195
2016	62.0689659118652
2017	60.0985221862793
2018	51.4563102722168
2019	56.038646697998
2020	56.038646697998
2021	56.038646697998
2022	55.5555572509766