Year	Number
1976	11.592151781200627
1977	9.179821447570694
1978	6.070954473580915
1979	7.680030209077549
1980	7.177120866684032
1981	5.047205361728681
1982	5.364649213068901
1983	4.977711106035018
1984	4.627085290076037
1985	6.497288517827048
1986	7.111735866554689
1987	7.326293621313261
1988	6.119310476153942
1989	5.009598276024596
1990	4.417434978706919
1991	4.20051047224716
1992	5.549237361605383
1993	5.478542012194987
1995	6.256105246187236
1996	6.154993343349771
1997	6.354596824356819
1998	7.376964589750662
1999	6.936305508351892
2000	8.315689931942186
2002	8.514368004391113
2003	10.110873579291837
2005	17.647340011684243
2006	21.46826356939482
2007	23.82292409004554
2008	25.267333106010316
2009	26.13000277095903
2010	26.3238262485842
2011	31.43000580691496
2012	29.882034719136666
2013	29.255531816118367
2014	26.256206396885528
2015	24.370161449281415
2016	26.36282202705727
2017	24.10345125556229
2018	22.022637281180643
2019	20.23824623366248
2020	24.74323915415896
2021	19.850288639662008
2022	15.883078247976593