year   vol
1   1984 130.3
2   2011 117.6
3   1986 103.8
4   1971  99.1
5   1917  95.4
6   1972  92.5
7   1921  91.9
8   1952  90.0
9   1983  86.3
10  2017  84.6
11  1950  84.0
12  1982  83.2
13  1923  79.9
14  1922  78.9
15  1946  77.8
16  1936  77.8
17  1951  75.0
18  1974  71.2
19  1916  70.8
20  1932  69.8
21  1920  68.1
22  1965  67.6
23  1914  67.0
24  1985  66.8
25  2006  64.1
26  1980  62.8
27  1975  62.7
28  1948  60.1
29  1956  59.0
30  1967  58.7
31  2005  56.1
32  1976  53.7
33  1957  53.3
34  1996  52.8
35  1962  52.6
36  1949  51.2
37  1993  50.9
38  1943  50.8
39  1969  50.3
40  1978  50.2
41  1927  49.8
42  1973  49.3
43  1958  48.6
44  1937  47.9
45  1938  47.9
46  1929  47.4
47  1995  47.4
48  1928  46.5
49  1925  45.1
50  1964  42.1
51  2009  42.0
52  1924  41.6
53  1979  40.2
54  1953  38.5
55  1968  38.3
56  1933  37.8
57  1970  37.3
58  1966  37.3
59  1945  36.8
60  1955  36.0
61  1947  35.5
62  2008  34.1
63  2016  32.2
64  1919  32.1
65  1960  31.2
66  1954  29.9
67  2014  29.8
68  1987  29.5
69  1989  29.3
70  1963  28.8
71  1994  28.6
72  1935  28.6
73  1926  28.6
74  1930  27.6
75  1959  27.5
76  1944  26.6
77  1939  26.2
78  2000  26.1
79  2012  26.0
80  1991  24.9
81  1981  23.2
82  1915  23.2
83  2010  23.1
84  1942  22.0
85  1988  21.3
86  2002  21.1
87  2007  20.9
88  2003  20.6
89  2001  19.7
90  2013  18.6
91  1940  18.0
92  2004  17.9
93  2015  17.1
94  1977  16.6
95  1961  15.6
96  1941  15.4
97  1931  14.8
98  1990  14.8
99  1992  13.4
100 1934  13.2