*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001001
1970000000
1971000000
1972000000
1973000000
1974000000
1975003003
1976000000
1977000000
1978000000
1979000000
1980010001
1981000000
1982002002
1983000000
1984000000
1985000000
1986011002
198704110015
198800170017
19890370010
199001400014
19911720010
199243610041
19930112100113
19941355400360
19950271200273
19960370200372
19971212300216
19980303100304
199908820090
20000441200443
20010263300266
20020293300296
20030343400347
20040414500419
20050144700151
20061203700211
200712581500274
200801691700186
2009114210036
201001094400153
201101203500155
20120113000113
201301422400166
20140873200119
2015015006
2016023005
2017010001
Total104894287005191