Year	Number
1996	32.5
1998	30.348258972168
2000	52.2388076782227
2002	48.2587051391602
2003	45.2736320495605
2004	48.0769233703613
2005	54.3269233703613
2006	51.4423065185547
2007	53.3653831481934
2008	52.8846168518066
2009	54.9763031005859
2010	54.028434753418
2011	54.9295768737793
2012	56.8075103759766
2013	56.3380279541016
2014	59.1133003234863
2015	58.6206893920898
2016	57.6354675292969
2017	57.1428565979004
2018	59.2233009338379
2019	57.487922668457
2020	57.0048294067383
2021	57.9710159301758
2022	58.4541053771973