Year	maximum value in 2004 = 100
2006	18.5786409794
2007	18.7915229252
2008	16.9784150105
2009	20.1180610471
2010	17.3553335211
2011	15.2074433832
2012	15.0763014303
2013	20.1076328561
2014	21.576685466
2015	21.6111383491
2016	22.7131218813
2017	23.3020182947
2018	25.7703155321
2019	24.9866914881
2020	31.2345871064
2021	37.1603625085