Year	Number
1960	1273
1961	1256
1962	1245
1963	1244
1964	1255
1965	1270
1966	1303
1967	1351
1968	1391
1969	1411
1970	1417
1971	1424
1972	1431
1973	1435
1974	1418
1975	1381
1976	1337
1977	1287
1978	1232
1979	1222
1980	1254
1981	1282
1982	1307
1983	1331
1984	1350
1985	1371
1986	1386
1987	1398
1988	1419
1989	1445
1990	1461
1991	1482
1992	1515
1993	1542
1994	1566
1995	1588
1996	1614
1997	1644
1998	1674
1999	1705
2000	1735
2001	1780
2002	1837
2003	1889
2004	1943
2005	1999
2006	2055
2007	2103
2008	2147
2009	2191
2010	2234
2011	2266
2012	2293
2013	2334
2014	2392
2015	2463
2016	2547
2017	2645
2018	2743
2019	2842
2020	2941
2021	3035
2022	3133
2023	3242