*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197016015022
1970200103
1971400004
1972200002
1973300003
1974200079
19755001511
19765002310
19772008616
19784004311
197940212220
19807009016
198140011217
198250213121
19833009113
198450011016
19857015619
198660113323
198761211424
198890411428
1989903101032
1990703221749
1991409381162
1992300461059
199380660983
1994170136929128
1995808471578
19964013322372
199715026030107
19981003532793
19991410371365
20001501411168
2001130449975
200290265278
200380378594
20041101661593
200514039910126
200613041186141
200714021013120
20088001170125
20093062323244
20102022605269
20115003006311
2012130121211237
20134001783185
201400041243
201510123126
2016000606
2017000101
2018000000
Total333210325873333358