History of metro in charts
| 1955 | 1961 | 1965 | ||
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| 1974 | 1979 | 1981 | ||
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| 1981 | 1986 | 1987 | ||
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| 1991 | 1994 | 1995 | ||
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| 1996 | 2000 | 2006 | ||
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| 1955 | 1961 | 1965 | ||
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| 1974 | 1979 | 1981 | ||
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| 1981 | 1986 | 1987 | ||
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| 1991 | 1994 | 1995 | ||
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| 1996 | 2000 | 2006 | ||
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