*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970004004
1970000000
1971002002
1972000000
1973001001
1974002002
1975000000
1976001001
1977005005
1978001001
1979005005
1980003003
1981003003
1982003003
1983004004
1984001001
1985003003
1986008008
198700140014
198800110011
198900140014
199000170017
199100210021
199200190019
199300230023
199400220022
199500400040
199600220022
199700280028
199800330033
199900190019
200000370037
200100480048
200200780078
200300450045
200400250025
200500270027
200600280028
200700470047
200800430043
200900580058
201000390039
201100560056
201200650065
201300680068
201400620062
201500950095
20160011400114
20170015200152
20180014400144
20190018200182
20200019500195
20210021100211
20220010800108
2023005005
2024000000
Total002261002261