Year	maximum value in 2004 = 100
2006	24.4174974656
2007	23.8404283548
2008	22.6821781401
2009	22.5667401679
2010	21.8205115098
2011	21.0798474275
2012	22.4870874672
2013	22.7834538203
2014	15.9707384923
2015	14.1687046434
2016	12.9176993303
2017	11.8422914291
2018	12.0288827866
2019	11.1109136137
2020	11.0099952327
2021	7.3642450277