Year	Number
1996	56.5
1998	51.243782043457
2000	45.7711448669434
2002	43.2835807800293
2003	43.2835807800293
2004	41.3461532592773
2005	44.711540222168
2006	45.6730766296387
2007	47.1153831481934
2008	49.519229888916
2009	49.2891006469727
2010	52.1327018737793
2011	52.582160949707
2012	53.051643371582
2013	52.1126747131348
2014	49.7536964416504
2015	51.7241363525391
2016	49.7536964416504
2017	53.2019691467285
2018	56.7961158752441
2019	54.5893707275391
2020	56.038646697998
2021	54.5893707275391
2022	55.0724639892578