*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970103048
1970000000
1971000000
1972001001
1973000011
1974001012
1975001023
1976002024
197700110213
1978003003
1979107019
1980005016
1981017008
198200140216
1983004004
1984001023
19850750214
19860760114
198703100013
19881730314
198926100220
1990317180038
19911614210152
1992111130227
1993514310050
1994126260053
1995211320045
1996729230059
1997228470178
1998323400167
199918300241
200037360046
200126370146
200213570061
200355670178
2004411770193
20053510500113
2006959100105
20073610200111
20085510702119
20092219100195
20108315500166
201110921200231
2012089600104
201332690074
201416320039
201502290031
201600130013
2017011002
2018000000
Total10529818520382293