*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
19720
19730
19740
19751
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19904
19914
19921
19930
19942
19953
199612
19970
19981
19992
20000
20010
20020
20030
20040
20050
20060
20071
200825
200942
201031
201130
201218
201335
201419
201521
201619
20172
20181
20193
20202
20213
20224
20236
20249
Total306