*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19708004012
1970000202
1971200002
1972000000
1973100203
1974100001
1975000101
1976000303
1977000404
1978100001
1979000202
1980000202
1981100102
1982300508
1983000303
1984100102
1985300205
19862008010
19873007313
1988100629
19894004210
19903006716
199130019224
199240219328
1993200174362
199480223238271
199540030202236
199610236234273
19975002898131
199840026260290
1999400184365
200040032208244
200130033222258
200210036199236
200310132262296
200420030221253
200520131109143
20062025688148
20071015791150
20080006950119
20090009928127
2010004118107229
201100117070241
20121014682130
201310537127170
2014000217394
201500031435
20160023611
2017000000
2018000000
Total87024118030844375