*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970004004
1970000000
1971003003
1972000000
1973001001
1974003003
1975001001
1976001001
1977006006
1978001001
1979005005
1980004004
1981004004
1982003003
1983005005
1984001001
1985003003
1986008008
198700140014
198800110011
198900140014
199000170017
199100210021
199200190019
199300230023
199400220022
199500400040
199600220022
199700280028
199800330033
199900200020
200000370037
200100480048
200200790079
200300450045
200400250025
200500290029
200600290029
200700470047
200800430043
200900580058
201000390039
201100560056
201200660066
201300680068
201400620062
201500950095
20160011400114
20170015200152
20180014400144
20190018200182
20200019500195
20210021100211
20220010800108
2023005005
202400140014
Total002288002288