1972

−404.30

7.2

1975

−404.80

6

1984

−411.40

8

1986

−420.00

8

1988

−419.5

7.5

1990

−421.32

7.1

1992

−424.30

14

1998

−427.90

6

2000

−427.30

5

2002

−428.20

5.1

2004

−428.90

4.7

2006

−431.10

2.5

2008

−431.00

2.6

2010

−429.90

4.5

2013

−430.13

5.36