*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197021003024
1970000101
1971000000
1972100001
1973100001
1974000101
1975100001
1976200103
1977100001
1978200103
1979100001
1980100102
1981000000
1982200002
1983100102
1984100102
1985100001
1986300104
1987200316
1988101406
19895016113
199030112117
199140215324
199260228541
199340515125
1994301721389
1995102351250
199610138747
199760216428
199810037240
199910110214
200020324130
200130218124
2002503571681
200330224130
200430266374
200531118629
2006503931102
200740281390
200832126537
200930311118
201030272279
2011300271848
201220082535
201310035036
201400010313
2015000123
20160001161162
2017000101
2018100001
Total1213438753011343