*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970120401127
1970000000
1971000011
1972000000
1973000011
1974000000
1975001001
1976001012
1977202004
19784150111
1979201100132
198070120221
198115340123
198220870035
19831310470171
19842213350070
198571161800141
1986336130052
1987163340053
1988352360174
198902240026
1990227160146
1991392400081
19926984704128
199320118400115
199423427500140
199593250037
199689610078
199745169700158
199814128915121
199911149003118
200040289002160
2001404480193
200256621276
2003252580085
20041111470069
200594380253
2006203450270
200743630070
200896540271
200934500158
201081720384
2011778701102
2012113160232
2013132220138
201460160123
2015141250040
2016150160132
201741100015
20184440012
Total68440917002552850