1978

6.9

1985

5.9

2011

7.1

1988

6.5

2000

6.0

1998

7.5

1999

8.0

1966

6.1

2021

5.3

1990

7.5

1995

4.6

1928

6.0

1979

6.7

2016

7.5

2010

5.4

2003

8.8

1982

5.2

1994

5.8

2009

8.7

2025

6.3