Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1800 - 1854 1855 - 1965 1966 - 1973 1974 - 1986 1987 - 2000 yours sincerely English
1800 - 1846 1847 - 1960 1961 - 1966 1967 - 1982 1983 - 2000 sincerely yours English

Run your own experiment! Raw data is available for download here.
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