Year	Number
1980	2355
1981	2649
1982	2676
1983	2527
1984	2721
1985	2614
1986	2678
1987	2846
1988	3174
1989	3494
1990	4001
1991	3794
2016	70
2017	75
2018	32
2019	35
2020	54
2021	42