*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000033
1975100034
1976100023
1977200226
1978000123
1979100326
1980000101
1981100203
1982300104
1983200204
1984400105
1985201227
19864016112
19875018317
19885005111
19894115213
19907003515
199130513526
199270118329
199360112827
199460716938
19955069828
199620714124
199750314123
199830221935
199940222937
200040318530
200180419132
200210419125
200320221833
200450310523
200570422538
200680532752
200790836760
200850349259
200950463577
201030479995
201130356163
201270341152
201300253156
201400122023
201510019020
2016000202
2017000000
2018000000
Total1511917421391124