2015

7.4

1969

7.1

1965

6.8

1970

6.4

1968

6.5

5.4

1961

7.8

2009

4.7

1980

6.3

1976

6.7

1970

6.1

1953

7.1

1971

5.3

1977

5.9

2009

7.1

2011

4.6

1996

7.3

1994

6.5

1999

5.7

1995

7.7