*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19853
19860
19870
19881
19890
19900
19917
19926
19937
19943
19955
19960
19973
19980
19991
20001
20010
20021
20033
20043
20056
20065
200710
20082
20091
20104
201112
201214
201316
201421
201510
201624
201717
20180
Total186