*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002046
1970000000
1971000011
1972000011
1973000011
1974060006
1975032038
1976021036
19770560112
1978035019
19790460212
1980002024
19810050510
19820080311
1983012003
1984001023
19851420310
1986125019
19872380316
19882540314
19893780422
1990112120328
199169190337
199213110217
199329200233
1994315230748
199536220536
199665260542
1997217300958
1998011340651
1999052301139
200016300744
200116300643
200201440449
200335550467
200408390754
200514620572
200604611773
200703451958
200802640470
20092013904145
20101022702230
20111227602281
20120626608280
20130314500148
2014007007
201510100112
2016001012
2017000000
Total44187178821672188