Year	Number
1996	100
1998	100
2000	99.5024871826172
2002	100
2003	99.0049743652344
2004	95.1923065185547
2005	90.8653869628906
2006	92.3076934814453
2007	93.2692337036133
2008	95.6730804443359
2009	95.2606658935547
2010	93.8388595581055
2011	92.4882659912109
2012	90.1408462524414
2013	88.7323913574219
2014	89.6551742553711
2015	91.625617980957
2016	90.1477813720703
2017	89.6551742553711
2018	89.3203887939453
2019	89.3719787597656
2020	88.4057998657227
2021	88.4057998657227
2022	87.4396133422852