Year	Number
1971	109683
1972	120909
1974	135248
1980	226580
1989	234639
1990	248346
1991	253119
1992	258602
1993	267036
1994	273316
1995	278667
1996	279944
1997	283186
1999	283585
2000	277410
2001	303320
2002	289427
2003	297095
2004	299434
2005	306582
2006	290752
2007	288747
2008	283070
2009	289951
2010	275342
2011	275822
2012	273454
2013	271734
2018	275279
2019	274885