Year	maximum value in 2004 = 100
2006	32.8073882922
2007	33.2097943621
2008	35.3923476425
2009	36.7282155509
2010	37.8180021377
2011	35.1853612741
2012	36.6596831177
2013	39.2637590529
2014	38.3650340513
2015	44.3956624888
2016	43.6191683407
2017	45.2751434238
2018	45.3850805038
2019	44.7617136022
2020	47.2290853849
2021	48.8423676104