*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970003047
1970002002
1971001001
1972001001
1973001001
1974001001
1975004004
1976002024
1977004026
1978002013
1979016018
1980004004
1981003025
19820080210
198300401014
198400301215
19850140813
198612120823
198702240733
198810230630
198914110723
199015911127
1991814261453
199292231928261
199366132418652
199411251130092561
199572356291102403
19961239634092440
1997432724113369
199851631290111676
19991382101171
200031619390161677
2001173137017786
20021132941191381
20033977310151026
200411796230151835
2005318442119249
20060935641221022
200721295581181374
2008056080011651
200911808905275
20108679156010853
201123431190114659
2012258843118652
20131361624412876
2014158010400685
2015014400054
2016114100126
201712100013
Total1202265416691435824815