Year	Number
1994	8.30482
1995	9.33864
1996	9.81202
1998	10.63249
1999	10.73486
2000	10.50248
2001	10.2914
2002	10.4668
2003	10.79188
2004	11.35587
2005	11.09562
2006	11.10584
2007	10.85749
2013	11.75716
2015	11.69956
2016	9.96549
2017	9.86574