Years

Front 1

11,700

Back 1

1

Front 2

2.6

Back 2

2

Front 3

5.3

Back 3

3

Front 4

23

Back 4

4

Front 5

34

Back 5

5

Front 6

56

Back 6

6

Front 7

66

Back 7

7

Front 8

145

Back 8

8

Front 9

201

Back 9

9

Front 10

252

Back 10

10

Front 11

299

Back 11

11

Front 12

323

Back 12

12

Front 13

359

Back 13

13

Front 14

419

Back 14

14

Front 15

443

Back 15

15

Front 16

485

Back 16

16

Front 17

541

Back 17

17

Front 18

2.5

Back 18

18

Front 19

4

Back 19

19

Front 20

4.54

Back 20

20