1989

6.6

2000

7.1

2003

8.0

2019

6.7

2001

7.0

2002

6.1

2003

6.8

2000

6.9

1977

5.3

1958

5.2

1972

6.9

2002

6.3

1971

6.7

1948

7.6

2019

5.8

2013

5.5

1961

6.2

1967

7.2

2001

6.6

2000

6.2