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Source:
For 1980-87: J. D. Power (data based on new car buyers).
For 1998: Opinion Research Corporation International for NREL, Study # 707089, February 19 – 22, 1998, N = 1,019.
For 2000: Opinion Research Corporation International for NREL, Study # 709318, August 3 – 6, 2000, N = 1,013.
For 2001: Opinion Research Corporation International for NREL, Study # 710288, July 12, 2001, N = 1,004.
For 2004: Opinion Research Corporation International for NREL, Study # 713228, May 27, 2004, N=949.
For 2005: Opinion Research Corporation International for NREL, Study # 714209, May 20, 2005, N=1012.
For 2006: Opinion Research Corporation International for NREL, Study # 715238, June 8, 2006, N=1,007.
For 2007: Opinion Research Corporation International for NREL, Study # 716328, August 9, 2007, N=1010.
For 2008: Opinion Research Corporation International for NREL, Study # 717318, August 3, 2008, N=1,005.
For 2009: Opinion Research Corporation International for NREL, Study # 718339, August 14-17, 2009, N=1003.
For 2011: Opinion Research Corporation International for NREL, Study # 720229, June 3 - 6, 2011, N=1,011.
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