The volume of passenger road transport in Bulgaria amounted to 15.59 billion passenger-kilometres in 1994. Between 1970 and 1994, the volume rose by 3.35 billion passenger-kilometres, though the increase followed an uneven trajectory rather than a consistent upward trend.
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OECD. (October 31, 2025). Volume of passenger road transport in Bulgaria from 1970 to 1994 (in billions) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 21, 2026, from /statistics/437519/total-passenger-road-transport-in-bulgaria/
OECD. "Volume of passenger road transport in Bulgaria from 1970 to 1994 (in billions)." Chart. October 31, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 21, 2026. /statistics/437519/total-passenger-road-transport-in-bulgaria/
OECD. (2025). Volume of passenger road transport in Bulgaria from 1970 to 1994 (in billions). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 21, 2026. /statistics/437519/total-passenger-road-transport-in-bulgaria/
OECD. "Volume of Passenger Road Transport in Bulgaria from 1970 to 1994 (in Billions)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 31 Oct 2025, /statistics/437519/total-passenger-road-transport-in-bulgaria/
OECD, Volume of passenger road transport in Bulgaria from 1970 to 1994 (in billions) ÌÇÐÄÆƽâ°æ, /statistics/437519/total-passenger-road-transport-in-bulgaria/ (last visited July 21, 2026)
Volume of passenger road transport in Bulgaria from 1970 to 1994 (in billions) [Graph], OECD, October 31, 2025. [Online]. Available: /statistics/437519/total-passenger-road-transport-in-bulgaria/
