*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970004004
1970005005
1971001001
1972000000
1973001001
1974001001
1975001001
1976004004
1977004004
1978003003
1979015006
1980007007
1981007007
1982006006
1983004004
1984002002
1985203005
19860480012
19870280010
19880480012
1989210150027
1990323140040
1991514180037
199219140024
1993023260049
1994142500093
1995331330067
1996334610098
1997040570097
19980346800102
19990337300106
20000208800108
20010711600123
20020511500120
20031213000133
20043316500171
200511412200137
200602113800159
200732113000154
200815014800199
200977716300247
201039017400267
201124713400183
20121694200112
201351368800229
20141617900141
2015015200035
201624450051
2017014005
Total509472412003409