Original: In March 1995, Linux 1.2.0 was released (310,950 lines of code).
Simplified: On March 31 1992, alt. On March 14 1994, Linux 1.0.0 was released, with 176,250 lines of code. Strong development continued: January 25 1999 - Linux 2.2.0 was released (1,800,847 lines of code). January 4 2001 - Linux 2.4.0 was released (3,377,902 lines of code). December 17 2003 - Linux 2.6.0 was released (5,929,913 lines of code). April 16 2008 - Linux 2.6.25 was released (9,232,484 lines of code).