*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970001001
1971000000
1972002002
1973002002
1974002103
1975003003
1976008109
1977101204
19780091010
197900115016
1980005308
198110217020
198200010010
1983000202
1984001405
1985001304
198600210012
19871077015
198800128020
198910310014
199000513321
199100717024
199210317021
199300328233
199420535345
199500845053
199600733343
199720737551
199870333245
199940626339
200020544354
2001101043256
200220544253
200310386292
200430446255
200510575283
200600874587
200700579387
200800194095
200900181832203
201000182212241
201100132545272
20122001611164
201310083084
201400034236
201510116018
2016100001
2017000101
2018000000
Total3502231906542218