1966

6.1

1999

5.9

2012

5.6

2006

6.6

2000

6.3

1986

5.8

2004

5.1

1994

6.5

1992

6.4

1972

6.6

2013

5.6

2012

6.4

1895

5.4

2009

6.1

2024

6.5

1952

8.3

2014

7.0