*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000270027
1970103004
1971006006
1972002002
1973003003
1974002002
1975006006
1976004004
1977003003
1978001001
1979002002
1980004004
1981101002
1982004004
1983001001
1984002002
1985015006
1986114006
1987214007
1988315009
1989002002
1990013004
1991114006
1992015006
1993103004
199430120015
199510130014
199610140015
19972170010
19982180011
19991090010
200040100014
200121130016
200200150015
200312180021
200401120013
200510190020
2006108009
200700240024
2008008008
200941200025
201040170021
201130180021
201200150015
201300120012
2014007007
2015005005
2016003003
2017001001
Total401439400448