Тут всё просто. Заходим на сайт Федерации швейцарской часовой индустрии
http://www.fhs.ch/en/history.php и читаем:
During the 1970s and early 1980s, technological upheavals (appearance of the quartz technology) and the difficult economic situation resulted in a reduction in the size of the industry : the number of employees fell from some 90,000 in 1970 to a little over 30,000 in 1984, a figure which has remained stable over the last thirteen years (40,000 employees in 2004) while the number of companies decreased from about 1,600 in 1970 to about 600 now.
Т.е. сейчас около 600 часовых компаний в Швейцарии, а в 1970 было их 1600.
