1987

7.1

1988

6.7

1991

5.9

2004

5.5

1942

3.0

1990

6.3

2017

4.3

2002

6.1

1997

6.3

1990

4.9

2005

5.5

1979

6.7

2004

5.5

1998

6.1

1986

5.3

1988

6.4

1994

6.3

2017

2.8

1912

6.3

1999

4.0