ussrh.png
This image displays a line graph set against a white background with a grid of light gray horizontal and vertical lines. At the top center, there is a legend consisting of a small blue square followed by the text "USSR," indicating that the data represents the Union of Soviet Socialist Republics.

The horizontal x-axis at the bottom represents time in years. The labels run from 1850 to 2000 in increments of ten years: 1850, 1860, 1870, 1880, 1890, 1900, 1910, 1920, 1930, 1940, 1950, 1960, 1970, 1980, 1990, and 2000.

The vertical y-axis on the left represents a percentage value with very small increments. The labels start at 0.000000% at the bottom and increase in steps of 0.000200%. The top label is 0.002800%.

A single blue line plots the data for the USSR across these years. From 1850 until roughly 1920, the line remains flat along the bottom axis at or near zero. Starting around 1920, the line begins a gradual upward trend. By 1930, it has risen to approximately 0.000400%. The growth accelerates between 1930 and 1960. Around 1950, there is a slight dip or plateau where the value hovers around 0.001800% before rising again. From roughly 1960 to the mid-1980s (around 1985), the line climbs steadily to its highest point. The peak occurs slightly above the top grid line, reaching a value of approximately 0.002900%. After this peak, around 1990, the line drops sharply and continuously. By the year 2000, the value has fallen back down to roughly 0.000400%, ending near the bottom of the chart.
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