*Excludes Observations that spanned multiple years

Pre 1970120
19700
19711
19720
19732
19740
19752
19761
19771
19783
197919
19802
19812
19821
19831
19841
19850
19860
19874
19882
19893
199018
199120
199223
199314
199410
19957
19968
199710
19986
199928
200016
200115
200241
200370
200447
20058
200642
200749
200880
200988
201015
201131
201227
201312
201450
201547
201610
20170
20180
Total957