Year	Number
1962	1.430687465146383
1963	1.0969923956025878
1964	0.9943487660988058
1965	0.9479869510973951
1966	1.6214629528690665
1967	1.7239982078889016
1968	2.398691441669469
1969	5.105391940003578
1970	7.0891009915897705
1971	3.0227109192390773
1972	2.336766299708003
1973	1.0749286201730355
1974	0.6682755909951912
1975	1.9341221596088978
1976	1.3448241537969026
1977	2.2558546256693948
1978	1.4211827077383943
1979	1.1941198512606122
1980	1.0993310485493486
1981	1.1908887815011848
1982	1.3006458806926666
1983	1.6907274954792997
1984	2.2073810939348673
1985	2.878344300019358
1986	3.8221810634208517
1987	3.106987394314714
1988	3.9940833167117398
1989	2.850381438278072
1990	4.920949943879932
1991	4.2711325974072265
2005	8.229624026396847
2006	3.4056822813509116
2007	3.9444421630442075
2008	5.086646242870828
2009	4.455269934657578
2010	3.88809075841507
2011	2.6594665399937583
2012	1.5241877050651564
2013	1.7867171484714355
2014	2.827653433581304
2015	2.031456983022008
2016	1.9351339226184832
2017	2.1578815003456633
2018	2.245764590434568
2019	2.180653913057161