*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197053270062
1970200002
1971200002
1972200002
1973200002
1974200002
1975200002
1976200002
1977203005
1978101002
19792080010
1980306009
198120100012
19822070110
1983205007
19842080010
198520110013
19862090011
1987205007
198830130218
198940150019
199050250030
199140230128
199250370042
199351250132
199452440152
199551520159
199630560059
199730460251
199840500054
199940410045
200040490053
200160600167
200250580063
20035113800144
200460780488
200551870093
2006419501101
20074011000114
20081013801140
20096023100237
20106025300259
20115127602284
20120011604120
201300590059
201400300030
201510280029
201600110011
2017004004
Total1971023280222557