Year since 1970	48 Error 	N
0	185.8	13
1	242.0	137
2	390.6	38
3	246.2	54
4	206.5	64
5	256.9	92
6	285.2	113
7	331.0	14
8	323.5	59
9	160.1	98
10	273.2	140
11	248.3	146
12	244.6	29
13	190.7	18
14	265.3	122
15	222.5	106
16	237.5	42
17	229.6	95
18	143.0	109
19	192.1	165
20	194.1	157
21	191.9	31
22	167.8	99
23	179.5	60
24	209.6	62
25	160.2	344
26	128.1	217
27	150.1	51
28	144.3	233
29	139.7	223
30	131.8	164
31	125.1	133
32	122.4	123
33	107.4	202
34	94.4	240
35	101.2	323
36	96.6	135
37	86.2	60
38	87.5	232
39	70.1	50