*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700280010
1970000000
1971010001
1972000000
1973000011
1974010012
1975001001
1976000000
1977010001
1978000000
1979001001
1980000000
1981003003
1982002002
1983000000
1984018009
1985001001
1986003003
1987043007
19880550010
1989012003
1990090009
1991144009
19920870015
199303880147
199411331401149
199501671200179
199641491500168
199716470072
199812041302220
199907390183
200012611300275
200103761301390
200202091501225
200303692000389
200402052001226
2005140200061
20061674602116
20071943812136
20081944100136
20090525600108
20104877200163
20111467200119
2012411111801234
2013716218202353
2014926626000535
2015623939400639
2016429138700682
20171239356100966
20181234156010914
20196414666001086
2020020002
2021010001
Total78498536802178762