Year	Number
1996	71.5
1998	69.651741027832
2000	68.1592025756836
2002	69.1542282104492
2003	69.651741027832
2004	69.711540222168
2005	70.6730804443359
2006	68.2692337036133
2007	67.788459777832
2008	68.2692337036133
2009	68.2464447021484
2010	68.2464447021484
2011	67.1361465454102
2012	66.1971817016602
2013	66.6666641235352
2014	68.4729080200195
2015	69.4581298828125
2016	68.9655151367188
2017	66.5024642944336
2018	67.4757308959961
2019	61.3526573181152
2020	57.0048294067383
2021	57.0048294067383
2022	55.5555572509766