*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000404
1970000000
1971000000
1972000000
1973000000
1974000000
1975000101
1976000000
1977000101
1978000000
1979000000
1980000000
1981000000
1982000101
1983000000
1984000000
1985000101
1986000202
1987000617
1988000617
1989000358
199000222125
199100061016
199200152026
199300016162
19940001293105
199500043943
199600139498
19970004140144
19980003138141
19990003105108
200000116191208
20010016304311
20020008157165
200300012309321
20040004221225
20050007195202
200600017191208
200700030134164
2008000187593
2009000295281
20100007034104
2011000591776
2012000144458
2013000175370
201400061319
20150007714
2016000167
2017000000
2018000000
Total00638927313126