*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000516
1970000202
1971000101
1972000101
1973000101
1974000101
1975000000
1976000101
1977000101
1978000202
1979000101
1980000101
1981000101
1982000303
1983000101
1984000303
1985000101
1986000112
1987000404
1988001719
1989000549
1990101169
199100021214
199200141419
199300075259
199400110384395
19950024305311
19960003357360
199700053035
19980001226227
199900042630
20000007338345
20011003174178
20020009443452
200300014152166
20040006472478
20052001187100
200610013453467
20070008445453
2008000127183
20090014165107
201000039191230
201110039183223
20121007212220
201300192172265
201400030195225
201500010313
2016000235
2017000000
2018000000
Total70842750785520