SN4 ""

No	Pattern	Freq
1	over the last [num] years	723
2	over the last two years	79
3	over the last ten years	73
4	over the last five years	64
5	over the last three years	59
6	over the last twenty years	51
7	over the last 20 years	39
8	over the last 30 years	33
9	over the last 10 years	33
10	over the last thirty years	25
11	over the last four years	23
12	over the last six years	18
13	over the last hundred years	15
14	over the last 15 years	14
15	over the last 25 years	13
16	over the last fifteen years	12
17	over the last fifty years	11
18	over the last 40 years	9
19	over the last seven years	9
20	over the last eight years	9
21	over the last 13 years	7
22	over the last forty years	7
23	over the last 150 years	7
24	over the last twelve years	7
25	over the last 12 years	7
26	over the last nine years	7
27	over the last 50 years	6
28	over the last fourteen years	6
29	over the last eighty years	5