*Excludes Observations that spanned multiple years

Pre 197012
19700
19710
19720
19732
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19890
19900
19911
19920
19930
19940
19951
19961
19970
19980
19991
20000
20010
20021
20031
20043
20053
20067
20076
20084
200927
20105
201112
201223
201311
201414
201521
201625
20172
20181
20190
Total186