*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19872
19881
19890
19901
19915
19923
199310
19947
19952
19962
19972
19981
19990
20004
20010
20021
20031
20047
20051
20060
20070
20089
20096
20106
201147
20124
201321
20140
20150
20162
20170
20180
20190
20200
20210
Total145