Year	maximum value in 2004 = 100
2006	24.1071657673
2007	24.3256958378
2008	23.9899007104
2009	24.7535903239
2010	24.8983997437
2011	26.1658015064
2012	28.1527309935
2013	29.9534470774
2014	27.7960592424
2015	27.2797720453
2016	35.6073289168
2017	38.2677742813
2018	38.5069290184
2019	38.1600903297
2020	38.2614847573
2021	42.2284050886