TABLE 11 CENTRAL OFFICES AND ACCESS LINES BY TECHNOLOGY (BELL OPERATING COMPANIES) ELECTRO- ANALOG STORED DIGITAL STORED YEAR END TOTAL MECHANICAL PROGRAM CONTROLPROGRAM CONTROL OFFICES OFFICES OFFICES OFFICES 1980 9,195 6,842 74.4% 2,353 25.6% 0 0.0 % 1981 9,198 6,647 72.3 2,527 27.5 24 0.3 1982 9,173 6,357 69.3 2,736 29.8 80 0.9 1983 9,156 6,075 66.3 2,910 31.8 171 1.9 1984 9,102 5,714 62.8 3,041 33.4 347 3.8 1985 9,124 5,244 57.5 3,020 33.1 860 9.4 1986 9,167 4,604 50.2 2,943 32.1 1,620 17.7 1987 9,190 3,819 41.6 2,833 30.8 2,538 27.6 1988 9,300 3,031 32.6 2,692 28.9 3,577 38.5 1989 9,338 2,416 25.9 2,519 27.0 4,403 47.2 1990 9,872 1,646 16.7 2,410 24.4 5,816 58.9 1991 9,957 1,148 11.5 2,167 21.8 6,642 66.7 1992 10,069 615 6.1 1,924 19.1 7,530 74.8 1993 10,083 291 2.9 1,554 15.4 8,238 81.7 1994 10,021 95 0.9 1,133 11.3 8,793 87.7 ACCESS LINES SERVED BY TYPE OF OFFICE (THOUSANDS) ELECTRO- ANALOG STORED DIGITAL STORED YEAR END TOTAL MECHANICAL PROGRAM CONTROLPROGRAM CONTROL OFFICES OFFICES OFFICES OFFICES 1980 81,032 44,930 55.4% 36,092 44.5% 10 0.0 % 1981 82,581 40,425 49.0 42,099 51.0 57 0.1 1982 83,819 36,813 43.9 46,803 55.8 203 0.2 1983 86,186 32,652 37.9 52,919 61.4 615 0.7 1984 88,630 30,074 33.9 56,404 63.6 2,151 2.4 1985 91,455 24,778 27.1 58,532 64.0 8,145 8.9 1986 93,630 19,491 20.8 59,252 63.3 14,886 15.9 1987 96,593 14,205 14.7 59,442 61.5 22,946 23.8 1988 99,564 8,707 8.7 60,364 60.6 30,493 30.6 1989 102,684 5,646 5.5 58,846 57.3 38,192 37.2 1990 105,641 3,216 3.0 56,973 53.9 45,452 43.0 1991 107,387 1,876 1.7 53,450 49.8 52,061 48.5 1992 109,994 717 0.7 48,952 44.5 60,325 54.8 1993 113,369 264 0.2 41,912 37.0 71,193 62.8 1994 117,313 115 0.1 33,175 28.3 84,023 71.6 SOURCE: 1980-89 REPORTED IN CC DOCKET 89-624. 1990-94 REPORTED IN ARMIS 43-07. BECAUSE OF THE DIFFERING SOURCES, THE DATA FOR 1989 AND EARLIER YEARS MAY NOT BE ENTIRELY CONSISTENT WITH THE DATA FOR 1990 AND LATER YEARS.