2
10
20
30
40
50
20
1959
22
1960
22
1961
23
1962
20
1963
26
1964
28
1965
26
1966
22
1967
22
1968
17
1969
18
1970
20
1971
23
1972
24
1973
30
1974
40
1975
44
1976
34
1977
40
1978
43
1979
50
1980
30
1981
14
1982
23
1983
24
1984
22
1985
20
1986
16
1987
12
1988
12
1989
15
1990
12
1991
12
1992
13
1993
17
1994
16
1995
22
1996
24
1997
14
1998
25
1999
29
2000
19
2001
17
2002
19
2003
29
2004
30
2005
30
2006
21
2007
23
2008
24
2009
19
2010
16
2011
9
2012
8
2013
9
2014
3
2015
2
2016
2
2017
2
2018
