Annual years
1960 44.08555184549654
1961 44.38669692898199
1962 44.752181869799415
1963 44.913159302389474
1964 45.479043035092545
1965 45.49833778512448
1966 45.249104629175015
1967 45.92490500286339
1968 46.22309657358574
1969 46.432303092012454
1970 46.71848451975787
1971 47.19294226280559
1972 46.897389248458204
1973 47.692317433356436
1974 47.59806375439354
1975 47.759886910285246
1976 48.349588051513734
1977 48.635905194104424
1978 48.76360459955179
1979 49.26133573719398
1980 49.636537663393895
1981 50.05707329139295
1982 50.296849137981205
1983 48.70333059230755
1984 48.65266455523915
1985 49.0116307202704
1986 49.63971900795366
1987 50.075887540827416
1988 49.35972652652426
1989 50.68409978528842
1990 50.60772753372106
1991 50.390459609326314
1992 49.96211364753618
1993 50.27362797123776
1994 50.88258182085698
1995 51.001925289934114
1996 50.81068897051477
1997 50.97423135894741
1998 50.32591274422211
1999 51.237851908381884
2000 51.964481324772564
2001 52.18964821433305
2002 52.54079400419196
2003 53.022034589865925
2004 53.54545710980337
2005 54.21965080585815
2006 55.150546110049575
2007 55.93380171491422
2008 56.680418897396166
2009 57.62085154424316
2010 58.411149750144126
2011 59.29327138893369
2012 60.05078024686726
2013 60.709869561058234
2014 61.337917483240865
2015 61.85645814035946
2016 62.444050201953004
2017 62.92238962335024
2018 63.36586261118311
2019 63.75567791765332
2020 63.31386033068199
2021 62.454589645386356
2022 62.89903064853823