PERIOD	VALUE
1997	28208
1998	28163
1999	25062
2000	24774
2001	24752
2002	23216
2003	23351
2004	25444
2005	27337
2006	30083
2007	30692
2008	28101
2009	31545
2010	33960
2011	28915
2012	30658
2013	33232
2014	33626
2015	38756
2016	38426
2017	42795
2018	41710
2019	41014
2020	54947