1961

7.2

1979

5.6

2002

6.9

2005

6.3

2007

6.3

1966

6.5

1968

6.5

2007

7.3

1955

6.6

2004

6.9

1958

6.2

1967

8.7

1969

5.1

2007

5.2

2015

3.7

2000

4.7

1985

6.5

1979

7.3

1997

6.6

1994

5.8