Year	annual %
1961	3.2551097653292964
1962	8.504398826979472
1963	10.54054054054054
1964	1.8337408312958436
1965	18.445378151260506
1966	7.606547407895404
1967	6.0280681925214274
1968	10.331349382606378
1969	14.484702093397745
1970	5.13397566636191
1971	7.405177603853101
1972	13.446686596910812
1973	25.613505352731263
1974	42.52747973164922
1975	38.999110729508445
1976	21.841426018663547
2005	3.7065837809169637
2006	33.800543724509936
2007	37.10527315829113
2008	35.215069304834614
2009	26.703991944017986
2010	31.206274541048245
2011	20.69449487541359
2012	4.169426290759618
2013	15.967066704939043
2014	3.884168609862536
2015	-9.0995870094509
2016	7.026249792853441
2017	2.6426140061441235
2018	2.7285796405729434
2019	8.439401522407074
2020	15.917390288423627
2021	16.66278156584986