*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19762
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19919
19920
19932
19940
19954
19969
19971
19982
19992
20000
20010
20020
20030
20040
20050
20061
20070
200819
200929
201025
201117
201214
201326
201427
201515
201620
20170
20180
20190
20200
20210
20220
Total225