1960
1 trip
1961
1 trip
1962
1 trip
1963
1 trip
1964
2 trips
1965
2 trips
1966
1 trip
1967
1 trip
1968
2 trips
1969
1 trip
1970
1 trip
1971
4 trips
1972
2 trips
1973
2 trips
1974
4 trips
1975
1 trip
1976
4 trips
1977
6 trips
1978
4 trips
1979
1 trip
1980
1 trip
1981
1 trip
1982
2 trips
1983
2 trips
1984
1 trip
1985
2 trips
1986
1 trip
1987
2 trips
1988
1 trip
1989
2 trips
1990
2 trips
1991
2 trips
1992
2 trips
1993
1 trip
1994
1 trip
1995
2 trips
1996
2 trips
1997
1 trip
1998
1 trip
1999
1 trip
2000
2 trips
2001
1 trip
2002
1 trip
2003
1 trip
2004
1 trip
2005
1 trip
2006
1 trip
2007
1 trip
2008
3 trips
2009
2 trips
2010
2 trips
2011
1 trip
2012
5 trips
2013
5 trips
2014
3 trips
2015
4 trips
2016
3 trips
2017
10 trips
2018
3 trips
2020
1 trip