*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970300003
1970000000
1971000000
1972000000
1973000000
1974000077
1975100067
1976100135
1977100348
1978000145
1979100348
1980100304
1981500308
1982100203
1983100225
1984300104
1985100034
19861008312
19873007313
19882004612
19894108518
199040051322
199130026433
199220019526
199330125332
199470136852
199551125638
199640218125
199760018731
199870128743
1999120116736
200090031646
200160024232
200250026031
200350027335
200470112323
200550028740
200671040452
2007100125238
200840154160
200960178186
20105011882196
20116002082216
2012220115810191
20132211284137
201420015017
201500010010
2016000606
2017000101
2018000000
Total18351413211581681