Year	maximum value in 2004 = 100
2006	13.6399337931
2007	14.140332408
2008	16.6638040343
2009	18.456800546
2010	19.3061329198
2011	19.517680918
2012	20.454188731
2013	21.7424086546
2014	23.3200273107
2015	29.3661153573
2016	32.1929855536
2017	31.5500723456
2018	31.1068639534
2019	35.456202022
2020	34.3820085567
2021	34.5869279463