Year	Number
1996	58.5
1998	55.7213935852051
2000	58.2089538574219
2002	57.2139320373535
2003	57.7114410400391
2004	56.730770111084
2005	57.6923065185547
2006	54.3269233703613
2007	54.8076934814453
2008	54.8076934814453
2009	54.502368927002
2010	50.2369651794434
2011	50.2347412109375
2012	48.8262901306152
2013	49.7652587890625
2014	56.6502456665039
2015	58.6206893920898
2016	61.0837440490723
2017	59.1133003234863
2018	59.7087364196777
2019	59.9033813476563
2020	59.4202880859375
2021	58.4541053771973
2022	64.2512054443359