année, écart à la moyenne
            1961,0.79
            1962,-1
            1963,-1.07
            1964,0.36
            1965,-0.95
            1966,-0.43
            1967,-0.01
            1968,-0.33
            1969,-0.7
            1970,-0.73
            1971,-0.36
            1972,-0.23
            1973,-0.51
            1974,-0.39
            1975,0.04
            1976,0.14
            1977,0.33
            1978,-0.51
            1979,-0.03
            1980,-0.52
            1981,0.01
            1982,1.03
            1983,0.73
            1984,-0.09
            1985,0.33
            1986,0.77
            1987,0.14
            1988,0.94
            1989,1.13
            1990,1.1
            1991,0.28
            1992,0.93
            1993,0.95
            1994,2.06
            1995,0.96
            1996,0.55
            1997,1.66
            1998,1.04
            1999,1.01
            2000,1.63
            2001,1.5
            2002,1.73
            2003,2
            2004,1.28
            2005,0.71
            2006,1.78
            2007,1.58
            2008,1.26
            2009,1.64
            2010,0.54
            2011,2.33
            2012,1.49
            2013,0.82
            2014,2.25
            2015,2.3
            2016,1.86
            2017,1.9
            2018,2.67
            2019,2.22
            2020,1
            2021,0.18
            2022,1.78