Year,Value,NumPoints 1949,3.42953,51 1950,0.838987,51 1951,2.52461,51 1952,2.81205,51 1953,2.31491,51 1954,1.12947,51 1955,2.04045,51 1956,1.45663,51 1957,2.68144,51 1958,3.43536,51 1959,1.31088,51 1960,2.95563,51 1961,2.80552,51 1962,1.57881,51 1963,2.36631,51 1964,1.54246,51 1965,3.04261,51 1966,1.86077,51 1967,1.63768,51 1968,1.80147,51 1969,3.00348,51 1970,2.37952,51 1971,2.36781,51 1972,1.06643,51 1973,2.71225,51 1974,1.00504,51 1975,2.27861,51 1976,4.13971,51 1977,3.32178,51 1978,3.24643,51 1979,3.29258,51 1980,3.26629,51 1981,3.31184,51 1982,1.9949,51 1983,2.81293,51 1984,2.74461,51 1985,3.04862,51 1986,2.81648,51 1987,4.31333,51 1988,4.02731,51 1989,3.37026,51 1990,1.99453,51 1991,2.50229,51 1992,2.63492,51 1993,4.71038,51 1994,3.48398,51 1995,2.78927,51 1996,0.743205,51 1997,2.46383,51 1998,4.69207,51 1999,3.11024,51 2000,3.30697,51 2001,3.32977,51 2002,3.0792,51 2003,2.74302,51 2004,3.16143,51 2005,2.95917,51 2006,2.70364,51 2007,2.73153,51 2008,2.64934,51 2009,3.12315,51 2010,2.58218,51 2011,2.01038,51 2012,2.00796,51 2013,2.45244,51 2014,2.77148,51 2015,3.04481,51 2016,3.04076,51 2017,1.89384,51 2018,2.29852,51 2019,3.42553,51 2020,1.67277,51 2021,1.98689,51