year volume peak duration 1913 106.3 17400 153 1914 96.9 19000 120 1915 104.4 13900 143 1916 91.2 12300 129 1917 95.4 20100 117 1918 138.7 18500 169 1919 86.9 14200 125 1920 74.8 12600 113 1921 116.3 16900 133 1922 94.9 18800 122 1923 112.0 20600 134 1924 130.6 25600 131 1925 100.5 14000 137 1926 110.1 17900 130 1927 123.3 17700 148 1928 87.0 15500 129 1929 129.5 23500 129 1930 109.2 18500 138 1931 61.3 15800 85 1932 102.8 14900 124 1933 87.0 16300 119 1934 88.3 14900 110 1935 101.3 17800 129 1936 102.4 17100 130 1937 113.2 17400 128 1938 154.6 18800 184 1939 140.6 20200 154 1940 102.3 18200 128 1941 126.8 20900 147 1942 123.5 22600 130 1943 99.3 15800 111 1944 104.3 14300 142 1945 120.6 23000 127 1946 145.6 20900 159 1947 136.3 18500 145 1948 121.9 15600 130 1949 104.5 14800 134 1950 77.8 15200 107 1951 116.4 16300 144 1952 107.4 17400 111 1953 75.3 14100 103 1954 83.2 15700 107 1955 100.9 18300 105 1956 74.4 16300 84 1957 42.1 11300 78 1958 63.1 11500 85 1959 98.8 17800 131 1960 96.7 18000 119 1961 108.7 18200 128 1962 95.3 15300 136 1963 115.6 15700 150 1964 114.8 17000 135 1965 114.3 12800 164 1966 153.8 25900 155 1967 73.2 12900 105 1968 94.0 14700 138 1969 86.8 19100 110 1970 130.5 19000 149 1971 145.0 22900 142 1972 78.9 14200 117 1973 134.5 19700 160 1974 89.1 15900 111 1975 82.2 16400 112 1976 100.0 18200 137 1977 90.6 14400 133 1978 121.4 21300 133 1979 77.2 15200 107 1980 126.1 20600 141 1981 133.8 16600 179 1982 103.2 16600 138 1983 94.9 14600 132 1984 95.9 15400 130 1985 111.8 17100 150 1986 74.9 13400 116 1987 62.8 10800 92 1988 76.6 12600 115 1989 82.3 11100 128 1990 105.5 15954 158 1991 106.5 15954 144 1992 38.2 7499 79 1993 84.5 12963 128 1994 110.2 15781 138 1995 115.5 17580 133 1996 102.1 17330 131 1997 78.4 16031 106 1998 67.3 14232 91 1999 88.7 14943 126 2000 126.5 18892 151 2001 138.3 15844 172 2002 128.5 23150 137 2003 68.4 14683 103 2004 102.4 15836 129 2005 85.2 16040 115