*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197230
197310
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19843
19857
198610
198737
198847
198927
199010
199139
199235
19936
19947
199545
19961
19974
199829
199924
200030
200126
20027
200314
200418
200531
20066
200715
200822
200913
201053
201168
201229
201325
201441
201530
201628
201722
20180
20190
Total850