1990

5.6

2005

6.2

2015

7.5

1997

3.5

2002

6.1

1965

0.0

1938

0.0

1970

2.0

2000

5.4

2005

5.0

1986

6.1

1992

4.7

1998

6.3

1999

6.4

1992

7.5

2003

5.8

1962

7.6

1988

7.2

1927

7.8

1965

7.6