*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970700209
1970100102
1971200002
1972000000
1973200002
1974100067
1975100001
1976100124
1977000538
1978200327
197920011215
1980300306
1981500319
1982300407
1983300137
1984400307
19857012212
19866014415
19873025414
19884025213
198970211727
199050114727
1991316321052
199240014624
1993507251148
1994704252460
199590731653
1996506201445
1997904381869
19981104331260
1999100024640
200090232649
200180027540
200270038146
200330241551
200470029743
200560062573
200690159675
200790751673
20084133692109
20091031523159
20102022630267
20115033645377
201212073793401
20130011490150
201400018018
2015101709
2016000617
2017000101
2018000000
Total215210920672072600