Year	annual %
1961	4.154275471112896
1962	4.135437700851767
1963	4.147326006237307
1964	4.124389865847334
1965	4.2026104805906925
1966	4.1381312326037545
1967	4.125108881693706
1968	4.070871299067733
1969	4.030512307197071
1970	3.943457053355857
1971	4.030809292336372
1972	4.005858246503479
1973	3.9216319744250967
1974	3.748742644428148
1975	3.7408014984031297
1976	3.925997957681915
1977	3.848305243859059
1978	3.434218759266656
1979	3.4426260491439535
1980	3.5601339825721965
1981	3.5675669934403658
1982	3.5154707479058374
1983	3.698587778236842
1984	3.888165686493437
1985	3.8503523668740343
1986	3.80075996892721
1987	3.7785424795319784
1988	3.6107627536248117
1989	3.5028185136154093
1990	4.104032904962352
1991	2.9648983671116014
1992	3.2347990647447347
1993	3.389432557404888
1994	3.282970859826989
1995	3.0435752307279955
1996	2.760090241126065
1997	2.7072235924678694
1998	2.7665286162010574
1999	2.8464653801628828
2000	2.843633066711675
2001	3.0463881763998444
2002	3.1741159463299056
2003	3.2347678790601435
2004	3.1771147478414576
2005	3.213955359416886
2006	3.155156941866494
2007	2.96794885143629
2008	3.325450927807296
2009	3.418376662081556
2010	3.4217765768814985
2011	3.2329322189000465
2012	3.232119106591284
2013	3.3147687524045324
2014	3.208067263413426
2015	3.2104283426057236
2016	3.189491257562267
2017	3.141290422086044
2018	3.0570458404841787
2019	3.088239781081768
2020	3.184028295337484
2021	3.177641264746356
2022	2.3913211433098667
2023	3.333903096764004