2004

6.6

1989

7.8

1990

7.5

1997

6.5

2007

5.6

2017

6.9

2016

7.7

2014

4.6

0.0

2004

7.3

2007

7.4

1982

6.1

1942

5.8

1943

6.2

1939

6.7

1944

6.0

1968

6.8

1966

6.3

1964

6.1

1958

6.6