1972

7.1

2000

6.4

2000

6.6

2005

6.1

2006

6.7

2016

6.5

1963

7.2

2006

6.1

1998

6.9

1985

6.5

1986

6.8

1967

7.3

1994

6.2

1976

7.3

2005

5.9

1968

6.9

1994

8.3

2006

4.8

2006

4.8

2005

6.8