Year	Number
1996	4.89130449295044
1998	6.52173900604248
2000	9.78260898590088
2002	10.8108110427856
2003	12.972972869873
2004	13.4328355789185
2005	12.7450981140137
2006	12.2549018859863
2007	15.5339803695679
2008	16.990291595459
2009	17.7033500671387
2010	18.6602878570557
2011	21.3270149230957
2012	24.1706161499023
2013	21.8009471893311
2014	17.7884616851807
2015	12.380952835083
2016	12.380952835083
2017	12.8571424484253
2018	11.9047622680664
2019	10
2020	10.4761905670166
2021	9.5238094329834
2022	9.90566062927246