Year Growth (mm) 1931 2.63424714652438 1932 2.95123270661854 1933 2.64772415677376 1934 2.78762235910024 1935 2.14109111200784 1936 2.70649972469102 1937 2.82913740301944 1938 3.33332061962432 1939 2.99529102178342 1940 2.85920772633308 1941 3.35693932173404 1942 2.80233961185008 1943 3.9671355104807 1944 4.59068387326972 1945 2.26436460814768 1946 3.37292821010672 1947 3.6648985962613 1948 3.61248120645824 1949 2.68669592944982 1950 2.72376024868908 1951 1.68353633103084 1952 2.21074217659418 1953 1.41715869429772 1954 1.13293029845288 1955 1.13747327958788 1956 0.76099742251824 1957 0.89391387583898 1958 0.9520380145257 1959 0.92063918726506 1960 1.08596018139508 1961 2.01198548420234 1962 2.8533832182031 1963 2.90230447612366 1964 3.06889316917624 1965 3.3947347707531 1966 2.24265355849138 1967 2.60661881068642 1968 1.95892814504926 1969 2.10544509446588 1970 2.16462683914762 1971 2.68619694426034 1972 3.2195678784409 1973 3.16067440338328 1974 2.61998746168338 1975 2.91500194624302 1976 2.01344671442694 1977 1.99985337824562 1978 2.7901215710792 1979 1.70498973096114 1980 2.26263035051638 1981 1.94575071297136 1982 3.63349808470888 1983 3.79244681813158 1984 3.8845138188664 1985 3.62384147693044 1986 3.70308553548036 1987 3.94314032365786 1988 3.36224661915854 1989 3.8492724153463 1990 3.1296356575437 1991 3.04294777243112 1992 2.38101500358658 1993 3.39966180605268 1994 2.33537035187124 1995 3.01746611619616 1996 1.6203824492845 1997 2.00729544610466 1998 1.79064839044612 1999 2.4928925444056 2000 3.01922234424834 2001 3.31135793516014 2002 2.25360786417988 2003 2.34112710740368 2004 2.14734043488636 2005 3.33180294499394 2006 4.02525272038778 2007 1.9268039407329 2008 3.0072614532324 2009 3.92407576238396 2010 3.12322734185642 2011 3.7700478936966 2012 2.7895529986832 2013 3.39208988332762 2014 3.1612893219223 2015 3.5881389875253 2016 2.22524434344958 2017 3.59209824297482 2018 2.6924184208039 2019 2.4644458990003 2020 2.58954463903854 2021 3.6370306427644 2022 3.37142273002396