*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002024
1970000000
1971000022
1972000000
1973000000
1974040004
1975001001
1976010001
1977015017
1978023016
1979015006
1980003036
1981003014
1982006006
1983014016
1984001012
1985021003
19861480013
19871350110
19881260312
198914130321
199007110119
199127170026
199204210429
199357170029
1994416200242
199511210124
199638200031
199725250739
1998110240540
199904240432
200025220433
200125190632
200211320236
200323450252
200405310238
200508470257
200614600166
200702520155
200801650167
20093115800162
20102017601179
20111323001235
20121523004240
20130010100101
201400100010
201500140014
2016001001
2017013004
Total3713815620701807