Year	Number
1993	8.569712649
1994	8.8436002693
1995	9.1174878895
1996	9.3913755098
1997	9.6652631301
1998	9.9391507504
1999	10.2130383707
2000	10.4869259909
2001	10.7608136112
2002	11.0347012315
2003	11.3085888518
2004	11.5824764721
2005	11.8563640923
2006	12.1302517126
2007	12.4041393329
2008	12.6780269532
2009	12.9519145735
2010	13.2258021937
2011	13.499689814
2012	13.7735774343
2013	14.0474650546
2014	14.3213526749
2015	7.6688533678
2016	12.4734362007
2017	12.4734362007
2018	12.4734362007
2019	12.4734362007
2020	12.4734362007