*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002002
1970001001
1971000000
1972000011
1973001001
1974000000
1975000000
1976001001
1977001001
1978000000
1979000000
1980000000
1981010001
1982001001
1983000011
1984000011
1985002002
1986005005
1987035008
1988018009
198924140020
199041470025
199146110021
199298800097
199382510400137
199496118600256
199592717002208
199623212600160
1997945380092
199842011000134
1999119220042
200074115400202
200125840192
200241413200150
2003152812800171
200433226300298
20053279500125
20063258600114
200732712000150
200827713800217
20092310200107
201073919901246
201115110200154
201203390042
2013317640084
201426390047
201502210023
201601070017
2017010001
Total1187042638073467