Year	Number
1996	64.5
1998	61.6915435791016
2000	54.2288551330566
2002	58.2089538574219
2003	64.6766204833984
2004	67.3076934814453
2005	64.9038467407227
2006	53.8461532592773
2007	52.8846168518066
2008	51.4423065185547
2009	54.028434753418
2010	55.4502372741699
2011	55.8685455322266
2012	57.7464790344238
2013	56.3380279541016