Year	Number
2000	178000
2001	179000
2002	180000
2003	178000
2004	179000
2005	179000
2006	179000
2007	181000
2008	182000
2009	181000
2010	183000
2011	180000
2012	180000
2013	181000
2014	181000
2015	179000
2016	179000
2017	179000
2018	178000
2019	178000
2020	173000