Year	Number
1977	5.739565132130137
1978	5.9225353602034145
1979	9.58449578148494
1980	9.03467108117347
1981	4.730438598581791
2005	18.04098926580545
2006	22.920114110728672
2007	26.34084095503366
2008	24.130761968491157
2009	25.979939428648176
2010	26.078040485313025
2011	36.62003500947992
2012	27.77745564958002
2013	24.38694789775419
2014	21.30017535304109
2015	22.799655265403807
2016	26.480540386464135
2017	24.22099548817268
2018	21.604881227832863
2019	17.853680008169757
2020	26.5414483100168
2021	18.397932992677983
2022	12.855614625442874