*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970200103
1970000000
1971100001
1972000000
1973000000
1974100001
1975100001
1976200103
1977101507
1978100102
1979100607
1980100304
1981300306
1982100203
1983100001
1984100203
1985100203
1986200709
1987201609
19882026010
198930017020
199030228437
199120424333
199230115120
199330237345
199460067376
199540239146
199620851667
1997700957109
199860082997
199990276592
20003021144123
20011103890103
200250170177
20035011260132
20045001870192
20054001361141
20066001351142
20074001161121
20082011331137
20091091871198
20100082702280
20113063360345
201210021681181
20137001440151
201400057057
201500132033
2016000707
2017000000
2018000000
Total1380592883553135