1951

7.7

1988

7.5

2000

6.0

1990

7.0

1999

8.5

1995

8.0

1995

6.6

2014

6.1

1981

5.8

1971

7.2

1999

7.2

2007

6.2

2000

7.4

0.0

1996

7.7

2007

7.9

1978

5.9

1960

7.2

2016

6.3

2026

0.0