Year	Number
1996	100
1998	100
2000	99.5024871826172
2002	100
2003	100
2004	99.038459777832
2005	99.038459777832
2006	100
2007	100
2008	100
2009	100
2010	100
2011	100
2012	98.591552734375
2013	99.530517578125
2014	99.5073928833008
2015	99.5073928833008
2016	99.5073928833008
2017	99.5073928833008
2018	99.0291290283203
2019	98.0676345825195
2020	98.5507278442383
2021	98.5507278442383
2022	98.0676345825195